FLEXURAL BENDING FATIGUE TESTING OF METAL INJECTION MOLDED MATERIALS
ABSTRACT
 This report describes the method used by FloMet
LLC for obtaining fatigue data on metal injection molded
(MIM) parts. A sheet metal type molded specimen is used
and tested in the reverse bending mode to failure at a
variety of loads between the yield point and the
endurance limit. A curve of stress vs. number of cycles
is plotted on log paper out to 10 million cycles to
generate an S/N curve for the material. The endurance
limit is compared with the ultimate tensile strength
obtained from small MIMA test bars. The endurance limit
of as-molded and sintered surfaces is tested without
requiring machining of the specimens except for drilling
of the mounting holes.
FATIGUE PROPERTIES OF
MIM Fe-7% Ni AND 17-4PH
ABSTRACT
A
Flexural bending fatigue specimen to test metal
injection molding (MIM) alloys is proposed. Two alloys,
17-4PH stainless steel and Fe-7% Ni, are processed into
fatigue and tensile specimens. S/N curves are generated
and compared to relevant mechanical
properties.
FATIGUE STRENGTH OF CASE HARDENED MIM Fe-7% Ni Alloy
ABSTRACT
The
endurance limit for a case hardened 7% nickel-iron alloy
was measured using a flexural bending fatigue specimen.
The case hardened alloy had an endurance limit that was
almost three times higher than that obtained from the
same alloy in the fully hardened condition.
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